package org.springleaf.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {

	/**
	 * 将密码转化为32位不可逆的字符串
	 * 
	 * @throws NoSuchAlgorithmException
	 */
	public static String encrypt(String text) throws NoSuchAlgorithmException {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(text.getBytes());
			byte b[] = md.digest();

			int i;

			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}
			return buf.toString();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			throw e;
		}
	}

	/**
	 * 16md5加密
	 * @param text
	 * @return
	 * @throws NoSuchAlgorithmException
	 */
	public static String encrypt16(String text) throws NoSuchAlgorithmException {
		return encrypt(text).substring(8, 24);// 16位的加密
	}

}
